کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8857818 1619154 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Role of structure, accessibility and microporosity on sorption of phenanthrene and nonylphenol by sediments and their fractions
ترجمه فارسی عنوان
نقش ساختار، قابلیت دسترسی و میکروپوزیت در جذب فنانتهنه و نونیلفنول توسط رسوبات و کسر آنها
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
To better understand interaction mechanism of sediment organic matter with hydrophobic organic compounds, sorption of phenanthrene (Phen) and nonylphenol (NP) by bulk sediments and their fractions was investigated. Three surface sediments were selectively fractionated into different organic fractions, including the demineralized carbon (DM), lipid free carbon (LF), lipid (LP), and nonhydrolyzable carbon (NHC) fractions. The structure and microporosity of the isolated fractions were characterized by NMR and CO2 adsorption techniques, and used as sorbents for Phen and NP. The calculated micropore volumes (Vo) and specific surface area (SSA) values are positively related to the concentrations of aromatic C and char for the DM, LF and NHC fractions, suggesting that aromatic moieties and char component significantly contribute to the microporosity. The LF fractions exhibit greater sorption affinity than the DM fractions do, indicating that the presence of LP could block the accessibility of sorption sites for Phen and NP. Significant and positive correlations among log K′FOC values for Phen and NP and aromatic carbon and char contents, and Vo and SSA values suggest the aromatic moieties and microporosity dominate their sorption of HOCs by sediment organic matter (SOM). As the NHC fractions have much stronger sorption than other fractions do, they dominate the overall sorption by the bulk samples. This study indicated that the important roles of aromatic moieties, accessibility, and microporosity in the sorption of HOCs by SOM.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 219, December 2016, Pages 456-465
نویسندگان
, , , , , ,